Home
- What's New: home page and list of updates to this site.
- Site Index: a list of all of the page on this site.

Vim Scripts
- TagHighlight: highlighting of typedefs, #defines, enumerated names etc in Vim.
- EasyColour: colour schemes made easy!
- Bandit Colour Scheme: a colour scheme for Vim.

Metalwork
- Introduction: an introduction to the metalworking pages on my website.
- My Workshop: some information about my metalworking workshop.
- Mini-Lathe: improvements and tooling for my mini-lathe.
- SX3 Milling Machine: improvements and tooling for my milling machine.
- Harrison M250: improvements and tooling for my Harrison M250.
- Grinder: improvements and tooling for my bench grinder.
- Bandsaw: improvements and tooling for my bandsaw.
- Welding: projects related to welding.
- Miscellaneous: metalworking-related stuff that doesn't fit elsewhere.
- Metalwork Calculators: a selection of on-line calculators related to metalworking.
- Metalwork Data: some useful data for metalworking projects.

Woodwork
- Introduction: an introduction to the woodworking pages on my website.
- My Workshop: some information about my woodworking workshop.
- Hand Tools: hand tools and accessories that I've made.
- Power Tool Accessories: power tool accessories that I've made.
- Benches: benches that I've made.
- Furniture: furniture that I've made.
- Boxes: boxes that I've made.
- Outdoor Projects: outdoor projects I've done.
- Other Projects: woodwork projects that don't fit into the other categories.

3D Printing

Software
- ARPCalc: a powerful reverse polish calculator.
- Digraph: a simple tool to make symbol entry easier when typing.

Useful Tools and Notes
- Google Maps to GPX: a tool to create route plans for your GPS with Google Maps.
- GEMF Format: a format for efficiently storing map tiles for use off-line on smart phones with FAT32 or similar file systems.
- Ebay Seller Blacklist: a browser plug-in to allow you to blacklist bad ebay sellers.

Harrison M250 Change Gear Calculator

This tool can calculate possibly alternative gears that can be used to cut a particular thread on a Harrison M250. It works with either a 6 mm pitch leadscrew (the default) or a 4 TPI one (although I've done limited testing of the imperial version). It is heavily based on the work of Al Harral; I just thought it would be nice to have a web-based alternative for those (like me) who don't use Windows very much.

The code is based on Al Harral's GEARS.BAS so I certainly can't claim any credit for the intelligence behind this code: I simply ported it to javascript with some modifications to cope with the gearbox on the M250 and added some logic to make sure the gear combinations are possible with the banjo.

I haven't done a lot of sanity checking on this calculator yet, so if you notice any mistakes or problems, please don't hesitate to get in touch.

Leadscrew:	Metric (6 mm pitch) Imperial (4 tpi)
Available Gears:	Just standard gears (22, 40, 44, 80 & 88) Include extra gears (above plus 30, 35, 56, 63, 72 & 84) Include all gears (above plus 28, 40, 60, 76, 78, 81, 84 & 92)
Target Type:	Metric Pitch Imperial TPI
Target Pitch:
Target TPI:

This website is free, but costs me money to run. If you'd like to support this site, please consider making a small donation or sending me a message to let me know what you liked or found useful.